Mosque of Gawhar Shad, Iran

• The symmetry group of the tiling is 2*22 (cmm).
• All the internal angles of the constituent polygons are a multiple of 25.71 (π/7)°.
• Contains one regular 14-pointed star polygon with vertex angle of 102.85 (4π/7)°.
• There are five non-regular reflective tiles.
• The tiling satisfies the interlace condition and has no finite interlace and two infinite interlaces.
• The tiling is edge-to-edge.
• As drawn, contains about 313 polygons.

• Figure 438, page 159 (Mashhad, Iran, Mosque of Gawhar Shad at the Imam Riza shrine (1418)) of Trewin Copplestone. World architecture : an illustrated history, London: Hamlyn, 1966. [copple] {348p, text by Seton Lloyd}

• Tilings not constructible by straightedge and compass

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